function [mainconfig] = systemconfig()
%
% This routine reads and defines the system configuration
% System configuration refers to the external hardware
% and file paths. These may be dynamically changed by calling this
% routine.
% 12/2/2004 Paul B. Manis, Ph.D.
% pmanis@med.unc.edu
%
%
% The system configuration is defined according to each electrode
% Each entry has the following definitions:
% device - refers to system hardware that reads the electrode signal
% direction - input or output 
% vrange - system device voltage range (A-D range)
% bits - system device a/d conversion bits
% gain - amplifier gain (may be readable from amplifier)
% fixedgain - fixed gain between amplifier and a/d input
% channel - a/d channel to read for this input or d/a for output
% name - input designation
% units - input units when scaled using factors above
% lpf - low pass filter settings
% hpf - high pass filter settings
% offset - junction potential or other offset
% amplifier - tells us how to read a telegraph if it is present
%    0 - no telegraph, just read and scale
%    1 - axopatch 200 telegraph - use 13,14,15 to read telegraph
%    2 - multiclamp 700
% port - if multiclamp 700, which com port is associated with this signal?
% busid - if multiclamp 700, which busid is associated with this signal?
% 
